A multiplication table that incorporates the Cartesian coordinates, and aspects of Piet Mondrian's designs for an aesthetically pleasing appearance, to teach elementary school students concepts of multiplication, Cartesian coordinates, arithmetic sequences, geometry, and definite integrals. The XY Chart brings together two fundamental visual tools - the 10x10 multiplication table and the Cartesian coordinate system - in a natural way that makes learning them easy. Order online: Postcard $0.75; Letter size $2; Poster $10; Classroom Packages $30 and $50.